Carburetor



4July 21, 1931. H. HurcHlsoN 1,815,406

cARBuRToR Filed Aug. l. 1929' 40 is thereby positioned 21nd it S PleYelted from member 19 closed at its outer end and screwed 90 Patented .uly 21, 193i 1 i y vunirse STATES PATEN Fries HUGH HUTCHISON, OF CAMB'USLANG, SCOTLAND, ASSIGNOR TO EL H. GARBURETTER COMPANY LIMITED, F GLASGOW, SCOTLAND GARBURETOR Application led August 1, 192.9. Serial No. 382,652.

This invention relates to carburetors for and plan a modified form of mixing sleeve;

internal combustion engines and more espe- Fig. 4 shows the pilot jetair valve. cially for petrol engines. Referring to the drawings, the numeral 1 In the specification of my co-pending patdenotes the body of the carburetor within ent application Serial No. 89,440, dated Feb. which are a choke tube 2 and a throttle valve 5 19, 1926, which matured into Patent 3. it one side there is a chamber 4 for a pilot 55 #1,731,135, granted October 8, 1929, there is jet, lit-ted with vanes 11fL radiating froml it. described a carburetor inside which is an The lower portion 5 of the carburetor is open-ended chamber or sleeve spaced apart made separate from the upper portion and is from the carburetor wall and having inclined adapted to be attached thereto, by means of a l vanes inside and outside and Jfunctioning as set pin 6. The float chamber 7 is formed in bo a mixing sleeve. Air drawn into the carone with this lower portion 5. The lower buretor is divided into two supplies, one of portion is provided with a petrol passage 8 which, passing inside the mixing sleeve, leading to the base of the main jet 9 which picks up fuel trom a main jet and finely is screwed into the lower portion 5. The atomizes and diffuses it, while the second lower portion is drilled vertically so that the supply, passing around the outside of the pilot jet 10 may be inserted from the bottom mixing sleeve and whirling in the opposite and screwed into the pilot jet chamber 4, so direction meets the first supply charged Wlt l that it functions as a set pin in the same way fuel, causes further and more complete as the set pin 6. i atomization and diusion and reducestne Holes are provided in the bottom ot the mixture to a state ot quiescence before it is lower part below the main and pilot jets and induced into the engine. are adapted to be closed by screw plugs 12,13. According to the present invention, a Car- A mixing sleeve 14 is arranged to be introburetor for internal combustion englneS COIII- duced into the carburetor body from below. prises an upper body part, a lower body Part, This device is in the form of a ring having a means for removably attaching the 10We1 central boss 15 adapted to fit around andbbe part to the upper part and a lnlXlng" Sleeve supported by the main iet 9. The central sldable into the upper body partOIIl the boss 15 has Hat inclined'vanes or blades 1G bottom thereof and secured 1n pOSltlOn by the radiating Jfrom it to an outer cylindrical part fitting of the lower body part to the .Upper which, in turn, has fiat inclined vanes 17 body part. which extend to the wall of the carburetor This construction renders the fitting of the body, The mms 17 are inclined in Opposite mixing sleeve in place inside the body of the directions imm the vanas 16 Carburetor a simple matter. The Sleeve Ily The lower portion 5 of the carburetor has be adapted to be supported by the' nllln let radial air intake openings 18 provided in ito the carburetor which is screwed into place round the jet 9.` in the lower body part and 'when the latter An air valve is, provided for the pilot jet is, applied to the upper b0d7 part, the SleeVe chamber 4 (Fig. 4)' and comprises a tubular rotating by a Screw pln 0]. S11Ch11keinto a hole in the wall of the chamber 4.

In order that the InVeIltlOIl 12W be Clealy nut 2O locks it in place. A radial passage 21 understood 1t W111 110W be deSClbed by Way extends from its central bore. Outside the of exampleand with reference to the accommember 19 a Sleeve 29, '1S rotatably mounted,

panyng drawings, whereon: being held in place by a grub screw engaging 95 Fg- 1 is a Vertical mld-Sectlol 0f e C211'- agroove in the member 19. This sleeve has an buretor in accordance with this invention; aperture 23 which can be brought into regis- Fig. 2 is an inverted plan view of the ter with the radial passage 21 ot the member same; 19. 24 is a lever tor turning the sleeve 22.

.au Figs. 3 and 3a are views showing in section l/Vhen the carburetor is in operation air is im;

drawn in through the said openings 18 and, aositeiy inclined vanes, and a central boss on reaching the mixing sleeve 14, is divided situated within the endsof the mixing sleeve into two coaxial streams, one passing up beand so supported on said shoulder that the tween the varies 16 and the other passing up nozzle of the jet lies between the upper ends between the vanes 17. lVhen the outer stream of said boss and sleeve and so that the Inix- 7o emerges from the mixing sleeve, the conflg= ing sleeve secured in position by attaching uration of the body of the carburetor causes t ie lower body part to the upper body part. it to converge as a cone towards the axis of In testimony' whereof I afi'ix my signature. the carburetor body, The inner stream picks HUGH HUTGHISON.

1G up petrol from the jet 9 and Whirls the fuel so as to cause thorough atomization and diffusion of the latter. Higher up this mixture of air and fuel meets the converging outer stream of air which is whirled in the opposite 2.0. screwed into the lower part 5 andis thereafter $5 attached tothe upper part and secured in position. Dismantling and assembling of the carburetor can be quickly effected, the mixing sleeve 14 fitting loosely into the carburetor body. The mixing sleeve can be removed without detacliing the carburetor from the manifold of the engine. 3Q A cross section of a iiiodiiied form of mix- 95- ing sleeve is shown in Fig. 3, the depth of the said sleeve being comparatively small.

35 part 5. 190 I' claim:` i

1. In a 'carburetor having an upper` body part7 a lower bodyy part, means for removably attaching the lower part to the upper 4.-@ par-t, a Jet attached to andp'rojeeting upward I 105 from the lower par-t, a mixing sleeve litting into the upper partand comprising a ring, inner and outeroppositelyinclined vanes, and a centr-al bosssupported by said jet so that 45. the mixing sleeveis secured in position by zittach-ing the lower body part to the upper 2. n a carburetor having an upper body part, a lower body part, means for removably attaching the lower part to the upper part, Y a Jet attached to and projecting upward from `the lower partz a shoulder on said jet, a mixinclined varies, and a central boss supported y 6.@ parte, a, lower body part, rifieansv for remov 125 ably attach-ing the lower` part to the upper part, a jet attached to and projecting upward from the lower par-t, a shoulder onsaid' jet, a ini-Xing sleeve litting into the upperpart @-5- and comprising a ring, inner and outer opf .130 

